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Publication Number: FHWA RD-03-081
Date: June 2003 |
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Updated Minimum Retroreflectivity LevelsFinal ReportPDF Version (837 KB)
PDF files can be viewed with the Acrobat® Reader® APPENDIX B: RAW DATA FROM MERCIER ET. AL.This appendix summarizes all of the sign visibility data collected by Mercier et al.(9) The complete set of data was never published and therefore is included here for documentation purposes. Table 32 provides a summary of the signs used in the study. The demand luminance results are shown in order following table 32. Table 32. Description of Signs Used in Visibility Study
The graphs that follow show the luminance demand data for the signs listed. The graphs can be matched with the data in table 32 using the graph code in the last two columns of the table and in the titles of the graphs. The graphs were scanned out of a draft final report and some information was lost in the conversion. The x-axis shows subject age in years. The y-axis shows the log luminance in cd/m2. The solid data points represent the demand luminance predicted by CARTS. The open points represent the subjects' performance
Figure 9. Right Curve (E1)
Figure 10. Right Curve (A1)
Figure 11. Right Intersection (E2)
Figure 12. Right Intersection (F3)
Figure 13. Right Intersection (A2)
Figure 14. Right Intersection (B3)
Figure 15. NARROW BRIDGE (E3)
Figure 16. NARROW BRIDGE (A3)
Figure 17. RIGHT LANE ENDS (E4)
Figure 18. RIGHT LANE ENDS (F4)
Figure 19. RIGHT LANE ENDS (A4)
Figure 20. RIGHT LANE ENDS (B4)
Figure 21. Bicycle (E5)
Figure 22. Bicycle (F5)
Figure 23. Bicycle (A5)
Figure 24. Bicycle (B5)
Figure 25. Pedestrian (F1)
Figure 26. Pedestrian (B1)
Figure 27. EXIT 25 MPH (F2)
Figure 28. EXIT 25 MPH (B2)
Figure 29. DO NOT PASS (G2)
Figure 30. DO NOT PASS (C2)
Figure 31. KEEP RIGHT (G3)
Figure 32. KEEP RIGHT (C3)
Figure 33. NO RIGHT TURN (G4)
Figure 34. NO RIGHT TURN (C4)
Figure 35. ONE WAY (G5)
Figure 36. ONE WAY (C5)
Figurge 37. STOP (H1)
Figure 38 STOP (D1)
Figure 39. DO NOT ENTER (H3)
Figure 40. DO NOT ENTER (D3)
Figure 41. Corning 12 (H2)
Figure 42. Corning 12 (D2)
Figure 43. Gravity (H4)
Figure 44. Gravity (D4)
Figure 45. SPEED LIMIT 50 (G1)
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